Passenger transport demandhttps://www.eea.europa.eu/data-and-maps/indicators/passenger-transport-demand-version-2
'Passenger transport demand' is defined as the number of pkm travelled every year in a country or group of countries. Inland passenger transport includes transport by passenger car, bus and coach and train.
'Modal split' is defined as the proportion of total pkm allocated to different transport modes every year.
The 'decoupling indicator' is defined as the annual changes in the ratio of pkm (inland modes) to GDP (in constant prices) growth.